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Regulation of phyllotaxis by polar auxin transport

机译：极性植物生长素转运对叶序的调节

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The regular arrangement of leaves around a plant's stem, called phyllotaxis, has for centuries attracted the attention of philosophers, mathematicians and natural scientists; however, to date, studies of phyllotaxis have been largely theoretical. Leaves and flowers are formed from the shoot apical meristem, triggered by the plant hormone auxin. Auxin is transported through plant tissues by specific cellular influx and efflux carrier proteins. Here we show that proteins involved in auxin transport regulate phyllotaxis. Our data indicate that auxin is transported upwards into the meristem through the epidermis and the outermost meristem cell layer. Existing leaf primordia act as sinks, redistributing auxin and creating its heterogeneous distribution in the meristem. Auxin accumulation occurs only at certain minimal distances from existing primordia, defining the position of future primordia. This model for phyllotaxis accounts for its reiterative nature, as well as its regularity and stability.
机译：几个世纪以来，植物茎周围的叶子有规律地排列，引起了哲学家，数学家和自然科学家的注意。然而，迄今为止，叶序的研究基本上是理论性的。叶子和花朵是由植物激素生长素引发的茎尖分生组织形成的。生长素通过特定的细胞流入和外流载体蛋白在植物组织中运输。在这里，我们显示了参与植物生长素运输的蛋白质可调节叶序。我们的数据表明生长素通过表皮和最外面的分生组织细胞层向上运输到分生组织中。现有的叶原基充当汇，重新分布生长素并在分生组织中形成异质分布。生长素的积累仅在距现有原基的一定最小距离处发生，从而确定了未来原基的位置。这种叶序模型说明了其重复性，规律性和稳定性。

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